<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
    #btn{clip:rect(0,0,0,0); position:absolute;}
  </style>
</head>
<body>
  <button id="btn"></button>
  <label for="btn">点击我呀</label>
  
  <script>
  var btn=document.querySelector("#btn");
    btn.addEventListener("click",function(){
      alert("1")
    })
  </script>
</body>
</html>